According to the theory of general relativity, a galaxy must have a certain amount of mass to be held together by gravity. However, scientists don’t see enough visible mass in many galaxies in ...

Now a wild new study suggesting that gravity can exist without mass, conveniently eliminating the need for one of the most elusive substances in our Universe: dark matter. Dark matter is a ...

So, a 5 kg mass on Earth has a 5 kg mass on the Moon because the amount of matter stays the same. Weight is the force of gravity acting on an object. Weight is a force and so it is measured in ...

But gravity only becomes noticeable when you have at least one very big mass (a planet for example). No, the distance is squared in the equation so it would have nine times the force (a third of ...

Although we take a lot of scientific knowledge for granted today, each of the basics – whether it be about light, gravity, mass or the shape of the Earth – had to be theorized and ...

the hypothetical carrier particle of gravity. Each of the fundamental forces is carried by an equivalent “boson” particle – some of which have zero mass, while others have a very small mass.

Floating weightless invariably leads to significantly reduced muscle mass in the same way that a patient’s muscles can atrophy if they spend too much time laying in bed. With no gravity to ...

While the star was alive, nuclear fusion created a constant outward push that balanced the inward pull of gravity from the star's own mass. In the stellar remnants of a supernova, however ...